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Re:Hash Array Mapped Tries (HAMT) to the Rescue by eeperson on Monday September 07, 2020 @03:15PM (#24401861)
Scala experimented[0] with implementing those in its standard library. I'm not sure if it made it in to the final release or not.

EDIT It looks like it did make it in: https://github.com/scala/scala/commit/d5ae93e1b35fac4002cfbf...

[0] https://github.com/scala/collection-strawman/issues/192

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